NC30Fe合金在氯化钠溶液中的微动腐蚀特性

发布时间：2018-02-19 21:25

本文关键词： 镍铬铁合金氯化钠溶液微动腐蚀腐蚀特性极化曲线交互作用　出处：《工程科学学报》2015年10期 　论文类型：期刊论文

【摘要】：在PLINT微动磨损试验机上附加电化学测试系统,采用十字交叉接触方式,位移幅值为100μm,法向载荷20、50和80 N条件下,研究NC30Fe合金传热管在氯化钠溶液中的微动腐蚀行为.使用电化学工作站记录微动腐蚀过程中开路电位变化,运用电位扫描法测量微动过程的极化曲线;采用扫描电子显微镜观察磨痕的表面形貌,光学轮廓仪测定磨痕的三维形貌及磨损量.微动磨损使损伤区域金属原子活性增大,腐蚀倾向增大,加速了NC30Fe合金的腐蚀.在氯化钠溶液中,NC30Fe合金由于微动磨损过程产生腐蚀产物膜起到润滑减摩作用,摩擦系数较纯水中降低;但因腐蚀与磨损的交互作用,在氯化钠溶液中的磨损量比纯水中高.氯化钠溶液中的磨损机制主要表现为磨粒磨损和剥层的共同作用.
[Abstract]:An electrochemical testing system was added to the PLINT fretting wear tester. The cross cross contact was used, the displacement amplitude was 100 渭 m, and the normal load was 2050 and 80N, respectively. The fretting corrosion behavior of NC30Fe alloy tubes in sodium chloride solution was studied. The open-circuit potential changes during fretting corrosion were recorded by electrochemical workstation and the polarization curves of fretting process were measured by potentiometric scanning method. Scanning electron microscope (SEM) was used to observe the surface morphology of wear mark, and optical profilometer was used to measure the 3D morphology and wear quantity of wear mark. Fretting wear increased the activity of metal atoms and increased corrosion tendency in damaged area. The corrosion of NC30Fe alloy was accelerated. The corrosion product film of NC30Fe alloy produced by fretting wear in sodium chloride solution had the function of lubricating and reducing friction, and the friction coefficient was lower than that in pure water, but because of the interaction between corrosion and wear, The wear rate in sodium chloride solution is higher than that in pure water, and the wear mechanism in sodium chloride solution is mainly the joint action of abrasive wear and delamination.
【作者单位】：西南交通大学机械工程学院摩擦学研究所;
【基金】：国家自然科学基金资助项目(51075324)
【分类号】：TG146.15;TG174.3

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